Bug#852599: texlive-latex-recommended, texlive-latex-recommended-doc: Replaces without Breaks make files disappear from other installed packages

[Andreas Beckmann <anbe@debian.org>]

Package: texlive-latex-recommended,texlive-latex-recommended-doc
Version: 2016.20170123-1
Severity: important
User: debian-qa@lists.debian.org
Usertags: piuparts replaces-without-breaks

Hi,

during a test with piuparts and DOSE tools I noticed your package causes
removal of files that also belong to another package.
This is caused by using Replaces without corresponding Breaks.

The installation sequence to reproduce this problem is

  apt-get install $VICTIM
  # (1)
  apt-get install $OFFENDER
  apt-get remove $OFFENDER
  # (2)

for
  VICTIM   texlive-latex-extra-doc=2016.20161130-1
  OFFENDER texlive-latex-recommended-doc=2016.20170123-1
and
  VICTIM   texlive-latex-extra=2016.20161130-1
  OFFENDER texlive-latex-recommended=2016.20170123-1

Note that these are valid partial stretch->sid upgrades.

The list of installed files at points (1) and (2) should be identical,
but the following files have disappeared:


4m35.6s ERROR: FAIL: After purging files have disappeared:
  /usr/share/texlive/texmf-dist/tex/latex/filehook/filehook-fink.sty     owned by: texlive-latex-recommended
  /usr/share/texlive/texmf-dist/tex/latex/filehook/filehook-listings.sty         owned by: texlive-latex-recommended
  /usr/share/texlive/texmf-dist/tex/latex/filehook/filehook-memoir.sty   owned by: texlive-latex-recommended
  /usr/share/texlive/texmf-dist/tex/latex/filehook/filehook-scrlfile.sty         owned by: texlive-latex-recommended
  /usr/share/texlive/texmf-dist/tex/latex/filehook/filehook.sty  owned by: texlive-latex-recommended
  /usr/share/texlive/texmf-dist/tex/latex/filehook/pgf-filehook.sty      owned by: texlive-latex-recommended

4m35.6s ERROR: FAIL: After purging files have been modified:
  /var/lib/dpkg/info/texlive-latex-extra.list    not owned


3m9.4s ERROR: FAIL: After purging files have disappeared:
  /usr/share/doc/texlive-doc/latex/filehook/README       owned by: texlive-latex-recommended-doc
  /usr/share/doc/texlive-doc/latex/filehook/filehook.pdf         owned by: texlive-latex-recommended-doc

3m9.4s ERROR: FAIL: After purging files have been modified:
  /var/lib/dpkg/info/texlive-latex-extra-doc.list        not owned


This is a serious bug violating policy 7.6, see
https://www.debian.org/doc/debian-policy/ch-relationships.html#s-replaces
and also see the footnote that describes this incorrect behavior
https://www.debian.org/doc/debian-policy/footnotes.html#f53

Filing only as important to not block migration before the freeze.
Please add Breaks matching all Replaces in the next upload.


cheers,

Andreas